Improvement in steam-boilers



1. L. sPmK & A. L. HuLLANn.

Steam-Boilers.

-No.\49,259, Patentedmarchsnwm.

OOOOOOO OOOOOOO OOOOOOOO OOOOOOOOO OOOOOOOO OOO OOO O OOOOOO OOOOOOWitnesses: Y Inv mor:

ai?? a? Attorneys.

UNITED STATES PATENT OFFICE.

JAMES L. SPINK AND ALBERT L. HOLLAND, OF MINNEAPOLIS, MINNESOTA; SAIDHOLLAND ASSIGNOR TO SAID SPINK.

IMPROVEMENT IN STEAM'BOiLERS.

Specilication forming part of Letters Patent No.1495259, dated March 31,1874; application filed January 29, 187g.

To all whom t may concern:

Be it known that we, JAMES L. SPiNK and ALBERT L. HOLLAND, ofMinneapolis, in the county of Hennepin and State of Minnesota, haveinvented a new and Improved Steam- Boiler; and we do hereby declare thatthe following is a full, clear, and exact description of the same,reference being had to the accompanying drawing forming a part of thisspeciiication, in which the figure is a front elevation of a boiler,showing our invention applied to it.

The invention relates to means whereby steam-boilers may be made moreeiiicient and convenient.

The invention will first be fully described in connect-ion with all thatis necessary to a full understanding thereof, and then pointed out inthe claim.

- A represents a boiler with return-lines, and having the subjacent pipeB connecting with a pipe-coil, O. The latter has a pipe, D, whichconnects it with cylinder E that is conjoined with the boiler byintervening pipes F F that enter just below the water-level. Gis ablowoft pipe; I-I, the fire-box surrounded by firebrick; I, theair-chamber that receives all the heat and transmits it. The blow-ottpipes for the cylinder E all iinally unite in one, and may be operatedtogether.

This construction promotes a continuous circulation of the water, andproduces in the Water a uniformity of temperature, which is a greatdesideratum.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is

The combination of the boiler A and steamgenerating sections, composedof heating-tube E, connecting` branch pipes F and intermediateheating-coil O, connected to the bottom ot' the boiler by pip'e B, andto the heating-tube E by pipe D, by which means circulation in theboiler is maintained, substantially as described.

JAMES L. SPINK. ALBERT L. HOLLAND. Witnesses:

GEO. M. MAECHANT, FRANK C. BALL.

